Newly revealed Pokemon Scarlet and Violet Pokemon Gimmighoul will have a unique form in Pokemon GO. This new form will act as a crossover event between Pokemon GO and Pokemon Scarlet and Violet, which will release later in November.
Gimmighoul the Coin Pokemon was confirmed after rumors of its existence began circulating on the internet. This Pokemon will have the unique ability to have different forms in different games. Gimmighoul will have a "Chest Form" in Pokemon Scarlet and Violet and a "Roaming Form" in Pokemon GO.
As of writing, Gimmighoul's Roaming Form is in Pokemon GO but has a unique interaction. Gimmighoul cannot be caught in Pokemon GO right now. It will show up on the map like a Buddy Pokemon after trainers spin the new Golden Pokestops that started appearing after the Dratini Community Day Classic. Spinning these Golden Pokestops will give trainers one mysterious coin that Gimmighoul is attracted to and more items than regular Pokestops. It will linger behind the trainer on the map but does not have a catch-screen animation. Tapping on the Pokemon only shows what is usually the Buddy Pokemon's Readable Mood symbol but replaces the face with the Mysterious Coin it's looking for.
Dialogue in-game reveals that Professor Willow and Paldean biology teacher Mr. Jacq will perform research in order to discover how to catch the Pokemon. When Pokemon Scarlet and Violet releases on November 18, Gimmighoul can be caught in Pokemon GO, and additional story details may be revealed in the days leading up to Scarlet and Violet's release. A feature that will link Pokemon GO and Pokemon Scarlet and Violet will release in 2023.
The decision to release the linking tool long after the release of Pokemon Scarlet and Violet is strange. As fans can expect, Pokemon HOME will be the link between the two, but the reason for the delayed feature is unknown. Pokemon caught in Pokemon GO cannot be sent to Scarlet and Violet until the link feature is released either, so for now Pokemon GO acts as a Roaming Form Gimmighoul holding pen.
It seems that Gimmighoul's chest is part of the key to holding on to the Pokemon. It's possible that Gimmighoul's chest is a special item that the player will have to discover in Pokemon Scarlet and Violet. This makes the delay a two-sided play to allow players enough time to find the chest and developers enough time to make sure the link between Pokemon GO, Pokemon HOME, and Pokemon Scarlet and Violet works as intended.
Source: Pokemon GO